66888972 has 36 divisors (see below), whose sum is σ = 169414336. Its totient is φ = 22252320.

The previous prime is 66888961. The next prime is 66888977. The reversal of 66888972 is 27988866.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (66888977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20322 + ... + 23382.

Almost surely, 2^66888972 is an apocalyptic number.

It is an amenable number.

66888972 is an abundant number, since it is smaller than the sum of its proper divisors (102525364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66888972 is a wasteful number, since it uses less digits than its factorization.

66888972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3678 (or 3673 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The square root of 66888972 is about 8178.5678452893. The cubic root of 66888972 is about 405.9303349776.

The spelling of 66888972 in words is "sixty-six million, eight hundred eighty-eight thousand, nine hundred seventy-two".